XML 136 R109.htm IDEA: XBRL DOCUMENT
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Long-Term Debt - Additional Information (Detail) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2018 CAD ($) Tranches | Jun. 30, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 USD ($) | Jun. 26, 2018 CAD ($) | May 06, 2018 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of tranches | Tranches | 2 |  |  |  |  |  |  |
Additional revolving credit facilities amount | $ 400,000,000 |  |  |  |  | $ 200,000,000 |  |
Gain on modification of revolving credit facilities |  | $ 1,400,000 |  |  |  |  |  |
Credit facility average interest rate |  |  | 4.53% | 3.20% |  |  |  |
Letter of credit issued |  |  | $ 48,000,000 | $ 51,800,000 |  |  |  |
Letter of credit outstanding |  |  | 48,000,000 | 51,800,000 |  |  |  |
Letter of credit issued and outstanding in addition |  |  | $ 23,800,000 | 4,300,000 |  |  |  |
Canadian prime rate and US base rate [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Borrowing, interest rate basis |  |  | CAD: prime rate loan or a banker's acceptance, USD: US base rate or LIBOR advance, Sterling or Euro: LIBRO advance |  |  |  |  |
US funds [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facility payable |  |  | $ 13,600,000 | 106,900,000 | $ 10.0 |  |  | $ 85.0
Bonds issued under surety facilities |  |  | 791,400,000 | 587,100,000 | $ 580.2 |  |  | $ 467.0
Foreign currencies [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Bonds issued under surety facilities |  |  | 4,700,000 | 1,000,000 |  |  |  |
Canadian funds [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facility payable |  |  | 515,000,000 | 103,000,000 |  |  |  |
Bonds issued under surety facilities |  |  | 3,500,000 | 200,000 |  |  |  |
Expire before two thousand twenty [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Letter of credit issued and outstanding in addition |  |  | 14,700,000 | 4,300,000 |  |  |  |
Expire after two thousand twenty [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Letter of credit issued and outstanding in addition |  |  | 9,100,000 | 0 |  |  |  |
Revolving credit facilities [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facilities amount | $ 800,000,000 |  | 800,000,000 |  |  |  |  |
Revolving credit facilities maturity term | 5 years |  |  |  |  |  |  |
Agreement expiry date | Jun. 27, 2023 |  |  |  |  |  |  |
Unused capacity amount |  |  | $ 223,400,000 | $ 538,300,000 |  |  |  |
Notes payable [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Weighted average rate of interest |  |  | 3.16% | 3.46% | 3.16% |  |  | 3.46%
Aggregate maturity value of notes |  |  | $ 78,200,000 | $ 61,900,000 |  |  |  |
Notes payable [member] | US funds [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying amount of notes payable |  |  | 23,200,000 | $ 57,400,000 | $ 17.0 |  |  | $ 45.7
Notes payable [member] | Foreign currencies [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Carrying amount of notes payable |  |  | $ 32,900,000 |  |  |  |  |
Term loan [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facilities amount | $ 310,000,000 |  |  |  |  |  |  |
Term loan tranche B [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facilities maturity term | 4 years |  |  |  |  |  |  |
Agreement expiry date | Jun. 27, 2022 |  |  |  |  |  |  |
Drawn borrowing facilities | $ 150,000,000 |  |  |  |  |  |  |
Term loan tranche C [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facilities maturity term | 5 years |  |  |  |  |  |  |
Agreement expiry date | Jun. 27, 2023 |  |  |  |  |  |  |
Drawn borrowing facilities | $ 160,000,000 |  |  |  |  |  |  |
Tranche A [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Revolving credit facilities amount |  |  |  |  |  |  | $ 150,000,000 |
Finance lease obligations [member] | Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 1.40% | 1.40% | 1.40% |  |  | 1.40%
Finance lease obligations [member] | Top of range [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.25% | 5.25% | 5.25% |  |  | 5.25%

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